Materials Literature
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A mesoporous solid with crystalline walls and an ordered pore structure exhibiting a bimodal pore size distribution (3.3 and 11 nm diameter pores) has been synthesized. Previous attempts to synthesize solids with large ordered mesopores by hard templating focused on the preparation of templates with thick walls (the t…
An inorganic/organic heterostructure light-emitting diode consisting of the hole-transporting layer N, N'-di(naphth-2-yl)- N, N'-diphenylbenzidine (NPB) and n-type ZnO nanorods fabricated by hydrothermal decomposition is reported. Poly(methyl methacrylate) was used to form a smooth surface on top of ZnO nanorod array…
Abstract This paper presents a Monte Carlo simulation scheme to study the phonon transport and the thermal conductivity of nanocomposites. Special attention has been paid to the implementation of periodic boundary condition in Monte Carlo simulation. The scheme is applied to study the thermal conductivity of silicon g…
Cation-vacancy induced intrinsic magnetism in GaN and BN is investigated by employing density-functional theory based electronic structure methods. The strong localization of defect states favors spontaneous spin polarization and local moment formation. A neutral cation vacancy in GaN or BN leads to the formation of a…
Oxidation without organics: A tetraruthenium polyoxometalate (see picture; Ru blue, O red, Si yellow, W black) catalyzes the rapid oxidation of H2O to O2 in water at ambient temperature, and shows considerable stability under turnover conditions. The complex was characterized by several methods, including X-ray crysta…
High Resolution Image Download MS PowerPoint Slide Renewed interest in graphene architectures has opened up new avenues to utilize them in electronic and optoelectronic applications. The desire to design graphene−metal nanohybrid assemblies has led us to explore a solution-based approach of chemical reduction of AuCl…
We present a unified expression for surface-enhanced Raman spectroscopy (SERS). The expression contains a product of three resonance denominators, representing the surface plasmon resonance, the metal−molecule charge-transfer resonance at the Fermi energy, and an allowed molecular resonance. This latter resonance is t…
Flexible Gastgeber: Copolymere aus methacryliertem β-Cyclodextrin und N-Isopropylacrylamid bilden Einschlusskomplexe mit Anionen ionischer Flüssigkeiten (siehe Bild). Die Komplexbildung verändert die Löslichkeitseigenschaften des Copolymers und führt zu „Pseudopolyelektrolyten“. Trübungs- und dynamische Lichtstreumess…
The morphological evolution in ${\mathrm{La}}_{0.5}{\mathrm{Ca}}_{0.5}\mathrm{Mn}{\mathrm{O}}_{3}∕\mathrm{Sr}\mathrm{Ti}{\mathrm{O}}_{3}(100)$ ultrathin films has been revealed by atomic force microscopy. It was found that ordered linear defects, which are in 1--2 unit cells high and oriented along the cubic [110] and…
Abstract We found that novel nanoporous structures such as ellipsoidal‐ or string‐shaped nanopores were formed on the surface of the spherical bubbles in polycarbonate foams by annealing CO2‐saturated polycarbonate. The pores were surrounded by polycarbonate nanofibrils, and birefringence with spherical symmetry was s…
Estimates for the prevalence of sheep infected with classical scrapie are essential for assessing the efficacy of control strategies that have been implemented in Great Britain (GB). Here a back-calculation approach was used to estimate the prevalence in the GB national flock by integrating data on reported cases and…
This experimental work deals with the exposition of Pinus Pinaster wood samples to a DBD afterglow. Electrical parameters like duty cycle and injected energy in the gas are being varied and the modifications induced by the afterglow on the wood are analysed by several macroscopic and microscopic ways like wettability,…
Ein poröser Molekülkristall mit Wassermolekülen in den Kanälen – [La2Cu3{NH(CH2COO)2}6](H2O)n (siehe Bild) – zeigt ein scharfes Maximum der Dielektrizitätskonstanten bei 180 K (εr≈150) bei parallel zur Kanalrichtung ausgerichtetem elektrischem Feld. Der εr-Wert steigt oberhalb 250 K stark an, und es tritt eine charakt…
A series of chemically prepared Co2+-doped ZnO colloids has been surface modified either by growing shells of ZnSe or by the in situ encapsulation in poly(styrene). The surface modification effects using these two distinct chemical strategies on the magnetic properties of the nanocrystals were probed by electron param…
Silicon nanoparticles (Si-nps) embedded in silicon oxide matrix were created using silicon-rich oxide (SRO) films deposited by low pressure chemical vapour deposition (LPCVD) followed by a thermal annealing at 1100 °C. The electrical properties were studied using metal-oxide-semiconductor (MOS) structures with the SRO…
Abstract We report the formation of poly(propylene) spherical and ellipsoidal particles templated by carbon nanotubes via solution crystallization. With an increase in nanotube loading, the particle shape changes from sphere to ellipsoid. In the intermediate concentration range, both spherical and ellipsoidal shapes c…
High Resolution Image Download MS PowerPoint Slide The field-emission and current−voltage characteristics of individual W 5 O 14 nanowires were studied using a transmission electron microscope and a field-emission microscope. The individual W 5 O 14 nanowires made good ohmic contacts with W and Pt at room temperature…
By using the transfer-matrix method, we study the Anderson localization behavior in one-dimensional random systems composed of two different single-negative (SNG) metamaterials, in which either the permittivity or the permeability is negative. Both nondispersive and dispersive models have been adopted in this study. W…
Four new single crystals of sodium tetrakis(2-pyridinecarboxylato)Ln(III), where Ln is europium and terbium, with general formulas of Na[Ln(C 6 H 4 NO 2 ) 4 ]·2H 2 O were prepared from a reaction of solvent-mediated polymorph selection. All the crystal structures were determined by using temperature-dependent single c…
Thanks to the unique power of muon-spin spectroscopy, we found that the quasi-one-dimensional Co-Rh oxides ${A}_{n+2}\mathrm{Co}{\mathrm{Rh}}_{n}{\mathrm{O}}_{3n+3}$ ($A=\mathrm{Ca},\mathrm{Sr}$; $n=1$, 2, and 3) exhibit a two-dimensional antiferromagnetic transition that ranges from ${T}_{N}^{\text{on}}=185\phantom{\…